Given the following AVL Tree

$]=[9$ Marks

Insert the number $4$ into the AVL Tree shown below and answer the following questions arter inserting the number.

A$.$ Imbalance at node with value

B$.$ Rotation required to make the tree AVL

$($If no imbalance present, then write $\text{'}$NA$\text{'})$

C$.$ Draw the final tree after balancing $($if required$).$

$($LL$/$LR$/$RL$/$RR$/$None$)$